#pragma once
#include <iostream>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include<functional>
#include "Log.hpp"
#include "InetAddr.hpp"
#include"ThreadPool.hpp"

using namespace log_ns;

const static uint16_t gport = 8888;
const static int gsock = -1;
const static int gbacklog = 8;

using task_t = std::function<void()>;

enum
{
    SOCKET_ERROR = 1,
    BIND_ERROR,
    LISTEN_ERROR
};

class TcpServer
{
public:
    TcpServer(uint16_t port = gport)
        : _port(port),
          _listensockfd(gsock),
          _isrunning(false)
    {
    }
    void InitServer()
    {
        // 1.创建socket
        _listensockfd = ::socket(AF_INET, SOCK_STREAM, 0);
        if (_listensockfd < 0)
        {
            LOG(FATAL, "socket create error\n");
            exit(SOCKET_ERROR);
        }
        LOG(INFO, "socket create success, sockfd: %d\n", _listensockfd);

        struct sockaddr_in local;
        memset(&local, 0, sizeof local);
        local.sin_family = AF_INET;
        local.sin_port = htons(_port);
        local.sin_addr.s_addr = INADDR_ANY;

        // 2.bind sockfd 和 Socket addr
        if (::bind(_listensockfd, (struct sockaddr *)&local, sizeof local) < 0)
        {
            LOG(FATAL, "bind error\n");
            exit(BIND_ERROR);
        }
        LOG(INFO, "bind success\n");
        // 3.因为tcp是面向连接的，tcp需要未来不断地能够做到获取连接
        if (::listen(_listensockfd, gbacklog) < 0)
        {
            LOG(FATAL, "listen error\n");
            exit(LISTEN_ERROR);
        }
        LOG(INFO, "listen success\n");
    }
    class ThreadData
    {
    public:
        int _sockfd;
        TcpServer *_self;
        InetAddr _addr;
    public:
        ThreadData(int sockfd, TcpServer *self, const InetAddr &addr):_sockfd(sockfd), _self(self), _addr(addr)
        {}
    };
    void Loop()
    {
        _isrunning = true;
        while (_isrunning)
        {
            struct sockaddr_in client;
            socklen_t len = sizeof client;
            // 4.获取新连接
            int sockfd = ::accept(_listensockfd, (struct sockaddr *)&client, &len);
            if (sockfd < 0)
            {
                LOG(WARNING, "accept error\n");
                continue;
            }
            InetAddr addr(client);
            LOG(INFO, "get a new link, client info : %s, sockfd is : %d\n", addr.AddrStr().c_str(), sockfd);
            // version 0 --- 不靠谱版本
            // Service(sockfd, addr);

            // version 1 --- 多进程版本
            // pid_t id = fork();
            // if (id == 0)
            // {
            //     // child
            //     ::close(_listensockfd); // 建议！防止子进程误操作

            //     if(fork() > 0) exit(0);

            //     Service(sockfd, addr);
            //     exit(0);
            // }
            // // father
            // ::close(sockfd); // 为了防止文件描述符一直被打开，一直不释放使文件描述符泄漏的问题。
            // int n = waitpid(id, nullptr, 0);
            // if (n > 0)
            // {
            //     LOG(INFO, "wait child success.\n");
            // }

            // version 2 --- 多线程版本 --- 不能关闭fd了，也不需要了
            // pthread_t tid;
            // ThreadData *td = new ThreadData(sockfd, this, addr);
            // pthread_create(&tid, nullptr, Execute, td);//新线程进行分离

            // version 3 --- 线程池版本
            task_t t = std::bind(&TcpServer::Service, this, sockfd, addr);
            ThreadPool<task_t>::GetInstance()->Equeue(t);
        }
        _isrunning = false;
    }
    static void *Execute(void *args)
    {
        pthread_detach(pthread_self());
        ThreadData *td = static_cast<ThreadData*>(args);
        td->_self->Service(td->_sockfd, td->_addr);
        delete td;
        return nullptr;
    }
    void Service(int sockfd, InetAddr addr)
    {
        // 长服务
        while (true)
        {
            char inbuffer[1024];//当做字符串
            ssize_t n = ::read(sockfd, inbuffer, sizeof(inbuffer) - 1);
            if (n > 0)
            {
                inbuffer[n] = 0;
                LOG(INFO, "get message from client %s, message: %s\n", addr.AddrStr().c_str(), inbuffer);
                std::string echo_string = "[server echo] #";
                echo_string += inbuffer;
                write(sockfd, echo_string.c_str(), echo_string.size());
            }
            else if (n == 0)
            {
                LOG(INFO, "client %s quit\n", addr.AddrStr().c_str());
                break;
            }
            else
            {
                LOG(ERROR, "read error: %s\n", addr.AddrStr().c_str());
                break;
            }
        }
        ::close(sockfd);
    }
    ~TcpServer()
    {
    }

private:
    uint16_t _port;
    int _listensockfd;
    bool _isrunning;
};